Engeenering

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SCHOOL OF ENGINEERING
YEAR 3 MECHATRONICS ASSIGNMENT

LAB REPORT

Reading an Analogue Voltage from a Potentiometer to turn a Motor on and off with reading of 40

Assignment 2
Owais Jahanzeb
BENG Mechanical Engineering with buissness

Lecturer: Dr. Tom Shenton

Aim & Objectives The aim of this lab is to develop a functioning program for the PICDEM board to read an analogue signal from a potentiometer and turning a motor on or off if the signal exceeds a certain limit. The program should depict the function that it should turn the motor ON and OFF if the potentiometer reading is less than or equal to 40. The practical uses of such program can be seen in automotive , injection moulding machines, wood processing machines, modern temperature controlled plants, speed control torque operations.

Developing Program 1

Figure 1. The schematic circuit & PICDEM board configuration for Program
Figure 1. The schematic circuit & PICDEM board configuration for Program

The objective of program is to read the correspondent voltage analogous to the potentiometer position and switch the motor on if the reading is over 40 and switch it off if the reading is less than or equal to 40, the value can be adjusted by twisting the screw clockwise and anticlockwise. The program works by implementing the following code.

PIC program for Test of potentiometer with value less equal to 40 with comments: include <p16f917.inc> extern DisplayDigit1, DisplayDigit2, DisplayDigit3 extern DisplayDigit4, InitLCD extern DisplayA, DisplayV, DisplayK, DisplayOmega extern DisplayRC, DisplayBATT, DisplayNeg, DisplayAC extern Display2DP, Display3DP, Display4DP extern DisplayDH, DisplayRH extern DisplayS1, DisplayS2, Displaym, DisplayM extern DisplayDecimal extern DisplayHex
STARTUP code ; linker command goto Start
PORT1 code ; linker command…...

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